Michael Grimm has described his win on America's Got Talent as "unbelievable".

The 30-year-old from Mississippi scooped the $1 million prize and chance to headline a Las Vegas show on Wednesday night's finale of the NBC competition.

He was crowned the winner over 10-year-old opera star - and early favorite - Jackie Evancho, with performance art group Fighting Gravity taking third place and singer Prince Poppycock finishing in the fourth spot.

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"I still can't find words. This is unbelievable. If the smile on my face can describe it then this is what I feel!" he said in a video interview backstage posted on the show's official website. "It's overwhelming."

The singer - who wowed the judges with his rendition of 'When A Man Loves A Woman' on Tuesday night's show - added that he was looking forward to the upcoming live tour: "I can't wait! I've never been on a bus traveling on the road so this is going to be fun."

Grimm also spoke about the experience of landing in the final two alongside Evancho to USA Today, saying: "I was so prepared to bow out - the biggest nightmare was standing next to [Jackie] on stage - I knew she was going to win. I just never thought of winning this."

He added: "To make it after so many years of struggling, it's like a big payday."